I have 1080i / 25 fps bluray and technical specifications is below.
https://www.imdb.com/title/tt1650048/technical?ref_=tt_dt_specCode:Camera Arriflex 435, Panavision Primo and Lightweight Lenses Panavision Panaflex Millennium XL2, Panavision Primo, Lightweight and Macro SM Lenses Laboratory Technicolor, Montreal, Canada Negative Format 35 mm (Fuji Super F-64D 8522, Eterna 250D 8563, Eterna 500T 8573) Cinematographic Process Digital Intermediate (2K) (master format) Spherical (source format) Printed Film Format 35 mm D-Cinema
What should I do for If I want to x264 encode? Yes I know 25fps is not Bluray compliant. Fps conversion is necessary and which way?
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"Normal" for film-based material? No, but not unknown. And certainly fully allowable.
For primary video streams: 1080i25 16:9 (or pillar-boxed 4:3 footage) is blu-ray compliant
For secondary video streams 1080i25 16:9 and 4:3 are blu-ray compliant
The Arriflex 435 camera supports 1 - 150 frames per second according to its data sheet, hence it is well possible that the movie was originally shot at 25fps. IMDB has no more details about it, it seems.
True, most film productions were taken at 24fps.
23.976fps (actually 24/1.001) is an NTSC TV compromise (for technical reasons), and 24fps films were simply slowed down to 23.976p for progressive DVD and Blu-ray (although blu-ray supports 24.0fps), and telecined to 30/1.001fps for NTSC TV / DVD.
For PAL TV and PAL compliant DVDs, 24fps movies were often speed up from 24 to 25 fps and encoded as 25i, reducing the run-time accordingly. Some were telecined ("Euro-pulldown") to preserve the original duration.
I don't know which route your movie has followed. It is well possible that 25fps is the original speed and encoded as (pillarboxed) 1080i25.
Apparently this movie has originally been released at film festivals in European countries which supports the assumption that it has been shot at 25fps (for PAL/SECAM TV compliance).
Last edited by Sharc; 10th Dec 2020 at 07:34.
Thank you both.